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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afb07719a4375bcb6a03252af8a2a0813cca5f529f70030d9f128ef263601fff' 
  AND token = 'P3zFGn0OiGthQjlPtMd80nsMHyV85fRCj5GzYz6yElM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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