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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbad8a4b46ccda10229d95112a1273cf90f6a730e7690dfbd24a3d2c9edf531d' 
  AND token = 'm32upQLgftdwmT8pBc97rsVgJ6jgMFRbgSuR8mFaiMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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