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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7999dce6997b56bce72e42c6adab63830495b19f386d827fe9e43a11049def39' 
  AND token = 'Wfe04r2IZFMsNkaKuXEQNf/rw10kujW8knCfGuIyX/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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