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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bccff7a653847a176b4899efec45ef89e85cceedb5e56a180bd94a4eab4dd59' 
  AND token = 'NIkgFsihK3zuZcCQwr7LwMhqWfCZOThQwJI3UfJK20c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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