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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '002e4589428c259b38b45e2dc623eb6bb43c5567344cc16c62c98ab65fd42d1c' 
  AND token = '0ZBJOStR5HixXS3ZiQsaQtOaAC9cpz6G7gi3F1JNHxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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