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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9f1816815be6630eeaf74dddb0d4cf4c185b1ebe2047278077212d7fe57b2e' 
  AND token = 'qzRRAZnjJ6TghsRSh1aca+gct3nh4a9rYWi8/+GqfIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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