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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4e7c0935dff990c1c08485213a747e75d97f467eb77055c37092766622b1e8' 
  AND token = 'Hb+3AvDw4MeH/qvchjScceaxllPoyi9OpdDV+f+33YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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