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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '553ee22f80bb98f5a6ab040243baa745decd93405fc494df01b1abebd5672887' 
  AND token = 'cWO8t0DdBPmQDd2qwYfySTgMOuERPVE+gQGaM2oWh+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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