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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a3a3b2da994d641c436d23ba187b93cd10b690c1946011f638ef99d63e81a9' 
  AND token = 'h9+ETvew1zwnBg1pX5rVfHy4AK/tIZqUrtwO1teCqi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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