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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94fcd0eb3d097dbdcbb8c99d0c50b947513bcd23b2ddd79042e7c25aa6d126d7' 
  AND token = 'uEDDHTcZEw4y0hdxWtmOfvjYyOJj1FWiDSDKs6oHrTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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