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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '674450f4e5d91ede2e0b921dfaa57627dee3c4d3309b692977119d32a7dc3dba' 
  AND token = '38H3omBg+mi/4vPoiKLJD5ritEHzfWDZw1KO0soVJNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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