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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb5292d0cff358a432f2eeaa99dc4ec4ec66bf4010b9919587663e24e28b509' 
  AND token = 'Y6kaR+YhWazUdDz1gh4kkqct/GA/H8PxZUeWbIynkVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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