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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff9c374ed6896c4935cf3c9846ef6a5ed10eda1ac0d84befe37ce070a91c176' 
  AND token = 'B3OnhC58m++X7RYle2lNgUGpQg7XPTyihUwOy23afG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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