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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bee3261ea3177ed2df101f0f1d246a0e8ec7ecca4c25a020ea742002196cd85' 
  AND token = 'J8/qLMwZD0wa7TvYAm8M212iLGm/pxSt50qC2uDShmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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