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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517184698f85e64a055a5be154e48e94826c0e09daf201021dbe25b4d2e9ce06' 
  AND token = 'sag+ZK8idEUIhMAFBO/9g6X41g9M0q2PNsY8ZUlkSvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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