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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '583c9e72d022d5aed3ff51e193cb617c90c98fc8c928e3a7438e50f8ef786e35' 
  AND token = 'ur1+/Y8Ayf3K8aLNYZIO+yqO2bMgzD9rmVMJ1ZjP0WI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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