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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efdf3a5c940d2189248f0a9c4dae629932f66efed3aff928aafb2cb3bc5b5cac' 
  AND token = 'WEWumgFeZ+PWUHf0W80q9Z1XZPT3uVWqc1cRG9529Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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