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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7d081e91d3e9bfd9156136f5883e4cc156c259795eccac2064a76f23b95caf' 
  AND token = 'dN6BxHh0mwV4UOj/37QDH2jNwYw6Rmtr2c6UJCbY30s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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