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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f9578be4c3d1e6526a515dfddb6046d1285cf7c857d77fae218174e2c157a2' 
  AND token = '9AMUj6VNmqa4x8BeVfgg8/WBqVBMcLJlpFkwqloUo6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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