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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b7ef30366dc9a425b74239eda7f36811bbb5a55132a6a1ae4952f146756a42' 
  AND token = 'JZ3SIUa6soVdRSIQOSPYoPFgA9IpvPexJgdEqlZloYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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