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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff45206d5f912af9c8a91e1a2db1addb6f5f551de4fa9bcd9a241e199e595f1' 
  AND token = 'Fzydc7t/vMC0LnspZkAVJYtrM0bMm+W+uW+ekFc7FD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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