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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d94b9fdbc669b875dcebb53ef3d69f2640e3ae331aac1cc9865463f04c5d871' 
  AND token = 'xLUBhk1lStwZ05DmZi0frJS0n/UqldVdWjHMw9wnCIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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