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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f834757b960a4152d4a22e01cc688485d2060bd0f66304f8bc1d7f45b2fb7a40' 
  AND token = 'nuE5POueTiPWro8Zs9VSoMrFLfL0Z1mHybcGhnIIfNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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