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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6238333574a068cdd0276428c056a7d5ec947fa8f9f5057c5be0eebdb54c55d0' 
  AND token = 'LGlTT9XxRDdBK9zyAx5mtjgL9CxRNy9Z/1RnDhgChrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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