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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12dfa09c63afa87b1353a1c3aa61f8be210cab400414b15a416b706537eb5ee' 
  AND token = '3AwTJuGzUpQ460jupZ20NUZQTuei1QnZF0N4D5owiKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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