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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2b968421486e05b14d94697eb9e5169bbd568c139b42281762c1728358f2067' 
  AND token = '/XsWEE17/TOaEQ8guNXvChnyd5WAhgqTMBevKle3EJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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