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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c80ebc9053e14072857511b6b07b4d149f092991f549423dfa6b42f8a9526433' 
  AND token = '1ssvaPMeNd9yse+ONMiYHpJ/mcii4el5zxdCUbdB7NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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