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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd3a00cf6f36a305c50338e257da89ca4e921931f8b241e97be63fc828ef2d4' 
  AND token = '7ZW2THoCJnEHVr/ATkcK6oc6JmtsVXzLXAuMxPWA3fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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