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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e44514f142402457cec2f5e399f0c45195ebb454b2722184bf8a4d0b9132112d' 
  AND token = '3FCwIkaTlXsSbKsQ0m01xStGKnNaThwFgND3qiEVhsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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