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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f1e7ecd82bd35189a5dd742694cba2b88fc24f4247ba0669f27f42bf92ea89' 
  AND token = '/vVbgAyE0wf06xaK9N91/hMfaTqo/64ypWw/pLhxYUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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