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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec433360a8944d67d90d831509c0472308fd0da51056392d54078f53e18bddbb' 
  AND token = 'VlBXIBk0+1tWQfvscnInV/f+c2yIuqDzfN3PyHWxX9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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