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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d09161d2b40d136a75ff7706014e5dd2f287d8acf2f0e20f1a07ebf776b063' 
  AND token = 'jUvdJoCe6MwWgRxYKqqU36vb+I/NbEo016inG/hAxCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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