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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5304dbfbecd7884728524b2d834259e2f00c3e4d385b537a9aaff56bacd7e884' 
  AND token = 'zPH4g2J6C/cJjsPXNnRTTW1rIDaIOd0ei9LtsiXl8rQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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