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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee06b7c9441000d6ec6538501d8fc770d54e7a6d1d3b50ace228fc91958bd080' 
  AND token = 'I5sNCgprbHlbVMAgxwLjuExxmilkSSL56vEyQszNW7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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