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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0554abc43b56eb27ab705b02aa27a0f688a42d1540667d164184e7c5d19a63' 
  AND token = '1mYCNmtV2SxgWL8kP4rhAnBWqowXdRjOrfYjJcH8jDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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