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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9233d81c65a1229304d9aa3fa2e0a62c9cccf1102a1ba396f225adc64b7ed441' 
  AND token = 'ZWGsRdJTE3O1dZEb2jcVEf0S/7qAhql/47949ry5obQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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