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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942cc3af1a88d7f03b150689bd91acd043110b58ac08c0a399c294f0d2b12d71' 
  AND token = 'AIk0UtK+NDyBT5Ck6DIkp/VmMWqGEeXBV7kjbjrtDqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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