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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7428d67d7913cf14808b17bcac324a917edbe44c511b45faddb7a6c7e3e0e8d1' 
  AND token = '8oVhDUfi+W/qsD4aQVaemxz7Fs8iQ4wF6WsJIfm1ThY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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