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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93098e266bd37702677a99f876b4c2adaeb8ce7cb3555815ddee27a089afd924' 
  AND token = 'lWLXQQ/Vw0aJhLExOF7ASvwkL9LDlB2sZMomZA1clMQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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