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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900dcb0b0e34f958f53154aead4984cd3e57164ed3f287ef786f60c0bac0d4c0' 
  AND token = 'TbjH6We9bJSmmFchDfMqygWrwafFbCt1vDmnWPU5V8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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