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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3701f09ed924d3601be25541fb684e8c97f2b728d4f29fc083080038241717' 
  AND token = 'yDTokl4E5wXNcepO2K2+UYAJdfjQ7Tqhc1xQy7d5+VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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