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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a1e8aaac0e430156b21fea475e438abe6f542c9c756d27bfbd03ddb87edfc19' 
  AND token = 'rShLlsL7xOQ9YbyUSDz+18pzPA9EnabOeOl1uOolY1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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