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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee4af1411c878d01e4b18b3da873ea2a763d273e18381cc1e59226470c115498' 
  AND token = '53QsQ3pVo4/J39NSUAieYgCFr4ySM/gomsawWe6/GvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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