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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a95da706b1a64c9d4e57ee6a6ac39fd5d59845aa8996716059fc3781b1b6f38' 
  AND token = 'tWrOmBA4tXNygTzs29AESPiTJSEKXklNzClB6zLIuW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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