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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '584a6dfdb681079caaf43e779b1c6a7e185195057ead734c57cc0e2f702096a7' 
  AND token = 'Md+G+cIm6Av7I0etan7DDeLrl2BJQKJE5XVSHk7PSyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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