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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb058efe318f946c3dbd28093691a533be7a8197a6319916a471f0f962329e5' 
  AND token = 'VmSg92iUUrRgNpJ35aqq+Zs7D91Qr5r/8W/ySwU4I1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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