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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30b3b0c4445f63b04240a5eaf4c33d0eedd5fc47b59b636df448eaf959ab3aa' 
  AND token = '8m1tFjvOi4535YBIAnZXVg5EK6NQwdZTktOyktsStlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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