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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ae93b7bb175238a1ceb26785caf09c7e09053477dd26be5b955808690883811' 
  AND token = 'm7uGjihFydMLoEfapuNKv0DaSlVfRQngj/Iz84Zj530=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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