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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b9de27337f9bb0672733ce23d89e8ce84ebcb59f9a5fcf564e3869e6b29493' 
  AND token = '9acCCWCpfzC7kppKry5ftC82sbrnsWjSLv2jlRpW3Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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