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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c0deaa1aafaf15a8a37b9897c70a82dd4e98152195c98732ec556d397e7f35' 
  AND token = 'g4ZPHx5E1GlBTxYI2QQBJvQgoZLNY6aY7xSgdWxBjfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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