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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81fa737fc0390d8865d9ea7ddfa39b7ba6894065414ed5fb8ab44b637249bf84' 
  AND token = 'Oql4SgpbgjNjGouw/LaM2nmk8ofiWSF68hiye/9q2R0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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