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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06825ede3fc21f3bdc536424d1a0d8658f29fd33517a0905068c76390eb3542' 
  AND token = 'sy6QszpUJ14r1gMZt6EP75NrDTmvu24vP+gne96PvmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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