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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '701827eef88fb3119d460e6188c4385cf66a9663f9ffbff83e029ae9b02a09f1' 
  AND token = 'rY5CCp+9NO+Q9/wXDe0VVvza1LhWWMP99ydavHCfXNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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