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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee1ff5688540b3ffd123e8d18005f5d5d5f54a86bdd575957f3d4aee7b66d93' 
  AND token = 'cHTmwg4pyKSbdVPMRNngr3KdvWkCt8YDZG6e4fOpez4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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