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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da11074e3891582282a7937dc0f2f8ed274f0106730e1d0302f42d7d9e137c9c' 
  AND token = 'RKhQUuEX0f1Gq1SllYPqx+rWaZS+hHYGXCgBynUEHRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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