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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c2bd051cea93a0df27551c91d57d0e5bd9cbb7ebacf7b1776e2c0bb0ac2b86' 
  AND token = 'y8BYQ3RCqLfMDhQ4lhTdylCk5Dmy/x3Lhm2zLFrjN20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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