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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c01611a8699c6d81cd19f1e5e41738675179c6fa3bbef0ba70ae4ccb068938e' 
  AND token = 'b+Mw8tPHQYtsOOfs3b5DeBETFjef761A/uhHvuYo4vY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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