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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55eff537a49c0cf1bc03d35bf0e709d182996da13df05869ce5242b0852ee58' 
  AND token = 'jstIjnKhgmA0B1jgWsFdi3IqtxWanvQAm/Qhc3rz2hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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