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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b890da0f09f83579b15ece24279f9d515d83be73a5c4aeab4c511f9801aac416' 
  AND token = '2shokjQRCdheTzYmCD8PgOT3sccw1k2qR4laXbx114I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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