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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2a64049670c6a07c8013291d0af4accbfbc173f513a0532fbf414cc641de6da' 
  AND token = '3oyLl+JjhZ5WJPj30KGcZyhnE0ezvG/zP69jd7ddljI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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