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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb741b9c75ee6291f7b5f257d4139cabdb3f1db08ab0db18ffabcd1f306f920' 
  AND token = 'GTPUqG0NLf7xrKD2ig3BjBx7V4w1epReW3RefJ5/jf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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