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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '806ffb0c5ee5d0b80e460929786d8d4549adae5963b306f18b81a8e569705acc' 
  AND token = '+s+FR/OpHeHIVcBKDwPA7GGD56G48QtBC/8FKwMZXuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}