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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1d16a618bd030526e186207fa42d87104138dcf73554fddcfbdd4a056bc6fa' 
  AND token = 'bbHO/OLd1F1pJKTmODNWq4wQin+ZW13zWC1cqgXQCeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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