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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0997c4d609acfb60c276f415294a592a5d7a845eb30f15bf859a13e51db9491a' 
  AND token = 'Hjw7JXAGf/y9Zt112gyldQVaAzk4kjvRP95BLv4LHeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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