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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a62515a04a2a6f581a72e000a0b412e861a28e08ea7c6de24a4e5ab17496d7f5' 
  AND token = 'EakrZ8jkz6H8DH49MqqHIt0ZHI18dUS/h4CY4VMPo4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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