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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c739db757a88e4871ae2a1f04b113a6e67e181e7bd55e7ed750b8f04d0931fb9' 
  AND token = 'CjJh+6grwQ15JJktlgVhz15jFkuCOcbbUrDi68CiOUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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