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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d154676cb650a19b90058bfe46cef683d2769e936235e8e9767b1b604cc40b7' 
  AND token = 'sg+8CufEA2NMxKvDN7YnUMdmlDy3dWNZ8J+rkZ5JI6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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