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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8610d9f2c7c73a206f0d9e6f7e51c435be71d95ae6f564a12711f7ffcd9a6dcf' 
  AND token = 'b1xMkF0uCU3XiOfYc6cpRxCBIksyoSvKfekdJdcxu80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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