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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa4ad92e6037e5270079c0ca95d7e30be44e208edd2a8eeec1569ef9430e6b9c' 
  AND token = '7n0Po0PmLYhP0kiE21RvfjuMRgmjmmIieCZMTeZ1gok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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