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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30627b2b147803f72a3a149e484e99c6a54f58bc1d5017dd570665ea606f521' 
  AND token = 'nfx8xl4klBpBxFRBcOFDGvS3RF3hBEYAcAkOIF2yyI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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