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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd02c66b66caab4bfb542c639d416ef23d7167a0c0a1a8d7e5a7e9444c05cc916' 
  AND token = 'rADIFit66cYghjxRn8oJzXjjs84zkWskWp3GVBc9KQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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